“It's really an amazing opportunity,” the 21-year-old Raonic said of the Olympics. “It's a rare one and it will be something brand new to me. It's going to be about representing myself well, representing Canada well, playing some good tennis and making the best of it.”

Raonic will be a long shot, as he has to face such tennis heavyweights as Roger Federer, Rafael Nadal and Novak Djokovic. But with a big serve and a spunky attitude, he might just surprise some people.

Tomas Berdych

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Tomas Berdych is the best Czech player and will look to bring back a medal for his home country.

Berdych has played well at Wimbledon, reaching the final in 2010.

This season, he won the Hopman Cup and the Open Sud de France. He was the seventh seed in the French Open, losing in the fourth round.

He is 28-8 for the year. On grass, Berdych has three career wins.

Berdych will look to channel his 2010 performance to contend for a medal in London.

In that tournament, he beat Roger Federer and Novak Djokovic before losing to Rafael Nadal in the finals. To medal in London, he will need to follow a similar path.

His technically sound game is capable of doing just that, and he will use a strong forehand to beat opponents.

While Berdych will have to play his best to get past the "Big Three," he certainly has a chance to advance deep into the tournament and, as in 2010, pull off some shocking upsets.

Andy Murray

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Andy Murray will have a lot of pressure on him, as he is Great Britain's best chance to win gold in tennis. As the hosts of this year's Olympics, all eyes will be on Murray.

Murray has struggled a bit this year, as his only win was at the Brisbane International.

There have long been high expectations on Murray in his home country. At Wimbledon, he has finished in the semifinals three times.

Part of his struggles can be traced to back problems. According to BBC, he does feel better:

"I feel much better," Murray told BBC Sport. "The grass will probably be good for me. I've had a few good days practice here and it all feels good."

If Murray's back is truly better, than he will be a contender. As the No. 4 player in the world, Murray will have to play like it in order to beat one of the "Big Three."

For the 24-year-old Murray, the Olympics are bigger than a Grand Slam, via the Daily Mail:

I'd be desperate to win Olympic gold. I think either winning a Slam or Olympic gold would be celebrated by the nation but winning an Olympic medal is something that belongs to your country as well. In sporting terms I would say the Olympics is bigger than winning a Grand Slam because everybody knows what Olympic gold is, whereas not everybody knows what a Grand Slam is.

With the hopes of a nation on his back, Murray will need to turn that desperation into results. In Grand Slams, he has been the bridesmaid three times, but never the bride.

Winning gold in London would be the signature moment of his career and would make him a legend in his home country. There will be lot of pressure.

If he handles it well and plays his defensive style to perfection, then Murray has a chance to pull off some upsets and win Olympic gold.